Screw



S. OLSON Aug. 11, 1936.

SCREW Filed July 8, 1935 ATTORNEY This invention relates to screws or fasteners for optical frames and mountings and has for the primary object the provision of adevice of this'character which may be easily and quickly secured against accidental removal or loosening during the use of the optical. frame or mounting. With these and other oliiects in view, this invention consists in certain novel features of construction, combination and arrangement of parts to he hereinafter more fully described and claimed.

For a complete understanding ofmy inven- I tibmrefrence is to be had to the following description and accompanying drawing, in which .Fi'gure l is a front elevation illustrating an optical mounting secured to a lens by a fastener constructed in accordance with my invention. Figure 2 is a similar view showing my inventionada'pted to an optical frame.

Figure3 is a fragmentary plan view illustratingthe same. a Figure! is a perspective view illustrating the fastener or screw.

'Figu retfl is a fragmentary perspective view showing acup seat for the fastener.

Figiire 5 is .a, fragmentary. perspective view showing the fastener secured by the cup seat.

Figure 1 is a fragmentary sectional View illustratihg me sani Figure 8 is a fragmentary plan view showing the same. a Referring in detail to thedraiwing. the nnmerai 1 indicates an optical mounting employed for attaching a temple bar to a lens 2. The mounti'ng includes spaced apertured ears 3 to straddle l the lens 2 and passing through the lens and the Glehwood, Application Jilly 8. 1935,

ol No. 36,2

other ear has threaded connection with the 5 shank 5.. Formed on the ear which abuts the head 8 of the fastener is a cup I to receive the head 6 and the latter has a flattened face 8. .To secure the fastener t against accidental removal, a-w'all of the cup I is bent to contact the flattened l0 faced and thereby retain the fastener against rotation and consequently unthreading from the threaded ear of the mounting. While the present invention has been described in use on an optical mounting employed for connecting a temple bar 15 to, a, lens, it also maybe used in connection with nose pieces for securing them to lenses or may bezemployed on an optical frame 9, as shown in Figures 2 and 3. The cup 1 forms an integral part of the optical frame.

Having described the invention, I claim:

In combination with an optical mounting having spaced ears provided with aiigned apertures a'rid the walls of one of said apertures being I screw threaded, an annular flange formed on one 25 of the ears about the aperture-thereof, a fastener; including ascrew threaded shank extend ing through the apertures and threaded to one from said ears.

SAMUEL OLSON. 35 

